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Old 11-01-2006, 05:37 PM   #1
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battery problems NiCd NiMH issues

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I am using Ni-Cd battery packs and I will need to replace them pretty soon. I'm thinking of going to NiMH batteries because they have greater capacity. Can i use my "universal battery charger" on the NiMH or do i need to buy a special charger?

I've had people tell me its no problem, and then there are those who disagree and say its dangerous.

The charger i am using had variable voltage and amps. I have used it for a year with no issues so far.
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Old 11-02-2006, 09:31 AM   #2
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Both people are right, technically.

You can charge nimhs using a regular nicd charger, but yes, it is also potentially damaging to your packs if you aren't careful.

A typical NiCD only charger will not detect the sharp peak drop when a NiMH cell reaches near it's full charge, because of this, the charger will not terminate when the battery is full, and will keep on charging. Obviously, this will damage the packs longevity. So while a NICD charger will work, it will require you to constantly monitor the batteries temperature levels. If it's getting hot, then it's charged and should be pulled off the charger immediately.

When all is said and done, using a NiCD charger on NiMH cells will probably shorten the cells life. Is a NiMH capable charger absolutely nescesary? No, but it's definately a good idea to use one.

I should also probably mention that some NiCD chargers will falsely detect when a NiMH is charged, and you will often find your self with a battery only 70% charged vs a full charge, and your NiCD charger refusing to continue charging a battery it's convinced is full.
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Old 11-03-2006, 08:44 PM   #3
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Thank you very much for the information, I guess its worth getting a new multicharger.
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